I installed software and games from discover and other from synaptic but for example, for 20 games only 10 is in the menu, if i search the game is installes but no icon on launcher.

every day kde neon disappoints me.

I had the same problem with my Windows so I bought a new PC. My last PC was really old. I remember when I had Windows 7 and played a Far Cry 3 on it, that was awesome. Now I have Windows 10 and play many games on it, my favorite one is Assassin Creed Valhalla available for 3080. I also use a lot of interesting features and items. I can buy items or exchange them with my partner player. In order to initiate and make the trading process possible you and your partner have to be on the same platform like Steam, PS, or Xbox. I Buy rocket league items on a web store that is safe and easy to use.

I experienced that when I downloaded ppsspp games but, I later discovered that I wrongly installed the game, which led to icon disappearing.
But when i installed following the right instruction, everything worked fine.